October may have arrived with the Mariners already out of the race, but Kade Anderson still gave Seattle a reason to keep paying attention.
The 22-year-old left-hander made his Major League debut in August, and by then the Mariners still had a faint shot at the postseason. Anderson didn’t derail anything once he got there. If anything, he added another jolt of belief to a team that was searching for one.
His first professional season was strong enough to earn him some serious recognition. Anderson was named Minor League Baseball’s Pitching Prospect of the Year and Debut of the Year at the MiLB Awards, a fitting finish for a pitcher who spent most of the year dominating in the minors before making the jump to Seattle.
The No. 3 overall pick in the 2025 MLB Draft went straight from LSU to Double-A Arkansas, and the numbers there were loud. Anderson went 10-1 with a 1.06 ERA and a 0.64 WHIP in 18 starts.
He struck out 135 batters, walked 13, and held opposing hitters to a .147 average. He also threw five no-hit innings twice and stacked up 13 scoreless outings before the Mariners brought him up.
Seattle called him up on August 22, and Anderson made seven starts in his rookie season. He finished 2-2 with a 3.79 ERA and a 1.23 WHIP, striking out 32 and walking nine. That’s a quick climb from Double-A to the majors, and he handled it well.
One of his best outings came at Coors Field, where he went seven scoreless innings, struck out seven, and allowed just four hits.
Now the focus shifts to what comes next.
For Anderson, the offseason is less about celebration and more about refinement. A rookie season like this gives the Mariners something real to build on, but there are still a few areas that could push him higher.
Velocity is one of them. Anderson averaged about 93.5 mph with his fastball in 2026.
That’s not overpowering by itself, but he made it work because of his command and his ability to mix four pitches. MLB Pipeline pointed out that he entered the season as the only prospect with four above-average-or-better pitches.
Even a small jump in velocity could make him a much tougher assignment.
Control is another key piece. In the minors, Anderson walked just 13 batters in 93.1 innings.
He carried that feel for the strike zone into the majors, where he issued nine walks in 35.2 innings. That’s already solid, and the upside is obvious if he tightens it up even more.
Baseball America also noted how unusual his command was with Arkansas. He rarely found himself behind in counts, and when he made a mistake, he had a knack for correcting it quickly and staying out of trouble. Trim the walks a little more, and he can put even more pressure on hitters.
There’s also the matter of his splits. Anderson’s rookie season produced reverse platoon splits, with a .655 OPS against right-handers and an .872 OPS against left-handers.
That stands out, but the sample is still too small to treat it as a finished conclusion. The Mariners will have time this offseason to keep working through it as he adjusts to major league hitters.
A 3.79 ERA is a perfectly respectable place to start. For Anderson, though, it feels more like the beginning of the story than the end of one. The Mariners now get the winter to look ahead to 2027 and watch where his development goes next.
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